4 (x + 2) = x - 7
4x + 8 = x - 7
4x - x = - 8 - 7
3x = - 15
x = -15 / 3
x = - 5
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2 (3x - 4) = x + 22
6x - 8 = x + 22
6x - x = 22 + 8
5x = 30
x = 30 : 5
x = 6
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4 (x-3) = 2 (x - 7)
4x - 12 = 2x - 14
4x - 2x = - 14 + 12
2x = -2
х = (-2) : 2
<span>x = -1</span>
Nado primenit formulu slojeniya uqlov i vse
А)Формула тангенс суммы
α=39°,β=6 °
Ответ. tg(39°+6°)=tg 45°=1
б)Формула тангенс разности
α=72°,β=12 °
Ответ. tg(72°-12°)=tg 60°=√3